Set designer John Arnone ("The Goat, or Who Is Sylvia?"), costume designers Jane Greenwood ("Morning's at Seven") and Martin Pakledinaz ("Thoroughly Modern Millie"), set designer Scott Pask ("Amour") and lighting designer Richard Pilbrow ("Our Town") talk about what it means for a designer to collaborate on a show; how that collaboration works with other designers, and the cast and director; and how they keep up with their hectic schedules.